JPS6137933Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a wick lifting device for an kerosene stove in which the wick is raised by a drive motor.

(Prior Art) Conventionally, a wick lifting device for an kerosene stove in which a wick is lifted by a drive motor includes, for example,
The devices shown in FIGS. 1 and 2 are known.
In this device, a cylindrical lamp wick 2 is fitted onto the outer peripheral surface of a cylindrical wick guide 1 so as to be movable up and down, a wick holder 3 is attached to the outer peripheral side of the lamp wick 2, and a rack 4 is attached to the wick holder 3. A gear 6 at the inner end of the rotating shaft 5 is engaged with this rack 4, and a switch mounting plate 8 is provided on the burner basket 7 outside the core guide 1, and a micro switch 9 is mounted on this switch mounting plate 8.
and insert the actuator 10 of this micro switch 9 into the opening 11 of the burner basket 7.
A packing 12 is fitted to the edge of the opening 11 through the opening 11 so as to face the upper part of the lead holder 3.

Further, as shown in FIG.
8 is connected.

Then, the main switch 17 is turned on, the drive motor 18 is operated, and the rotary shaft 5 is rotated to raise the lamp wick 2 together with the wick holder 3 through the engagement of the gear 6 and the rack 4. Then, when the lamp wick 2 reaches a predetermined height, the actuator 10 is actuated by the wick holder 3 to turn off the micro switch 9, and the drive motor 18 is stopped to stop the lamp wick 2 from rising.

However, according to such a device, the micro switch 9 is attached to the burner basket 7 via the switch mounting plate 8 by spot welding, etc., so that the mounting position of the micro switch 9 itself tends to vary, and the variation becomes large. For example, if the micro switch 9 is installed above a predetermined position, the gear 6 will be located at the end of the rack 4 and the rotating shaft 5 will stop when the wick 2 has risen to its fullest extent. Micro switch 9
Since the drive motor 18 does not turn off, the drive motor 18 continues to rotate.
The transmission gear from the drive motor 18 may break, or the load on the drive motor 18 may increase, causing the drive motor 18 itself to burn out. Conversely, if the micro switch 9 is installed below the predetermined position, the lifting of the wick 2 will be stopped before the wick 2 reaches the predetermined height. Even if the fuel is combusted, a normal combustion state cannot be obtained, resulting in so-called weak combustion, and the predetermined heating capacity cannot be achieved.

In order to solve the above problem, adjustment work is required depending on the actual product, making it unsuitable for mass production in the manufacture of portable kerosene stoves.

Furthermore, in the above structure, since the actuator 10 protruding from the micro switch 9 is inserted into the burner basket 7 through the opening 11 provided in the burner basket 7, the airtightness between the inside of the burner basket 7 and the outside air is significantly reduced. do.
In this case, a gasket 12 is interposed between the opening 11 of the burner basket 7 and the actuator 10, but since the actuator 10 moves, a sealant cannot be used and sufficient airtightness cannot be maintained. Since the gasket 12 is usually made of oil-resistant rubber, it is also a part where cracks over time are a concern.

When the above-mentioned airtightness is impaired, it is necessary to consider the possibility that kerosene may seep out from inside, causing odor and ignition.In addition, if the airtightness deteriorates extremely, This will allow air to flow in, potentially leading to a backfire.

(Problems to be Solved by the Invention) As described above, in the conventional device, it is difficult to cut off excessive rotational force to the rotating shaft, especially when the wick is raised to a predetermined height.

The present invention aims to solve this problem by preventing excessive rotational force from being applied to the rotating shaft when the wick reaches a predetermined height and the rotating shaft stops. The purpose is to

[Structure of the idea]

(Means for solving the problem) The present invention meshes a gear on a rotating shaft rotated by a drive motor with a rack provided in a wick holder that holds a lamp wick, and lifts the lamp wick by the drive motor. In the wick lifting device for a kerosene stove, a ratchet wheel having a claw portion on the outer periphery is fixed to the rotating shaft, and the rotating shaft has a claw metal fitting that can be engaged with and detached from the claw portion of the ratchet wheel. A claw bracket is rotatably provided for engaging the claw with the claw of the bracket, a drive spring partially provided with a hoop portion is wound around the outer periphery of the claw bracket, and the drive spring is attached to the rotating shaft. A driven gear is rotatably engaged with the hoop portion of the drive motor via a protrusion and rotated by receiving rotational force from the drive motor.

(Function) In the present invention, the driven gear is rotated by the drive motor, the pawl bracket is rotated via the drive spring, and the pawl bracket rotates the rotating shaft via the ratchet wheel. Raise the wick together with the wick holder through the gear and the wick holder rack,
When the wick reaches a predetermined height, the gear on the rotating shaft is located at the end of the rack and the rotating shaft stops, and the drive spring slips against the pawl bracket, which causes the wick to reach the predetermined height. When the lamp reaches a certain height, the rotating shaft is stopped to hold the wick at a constant height.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

In FIG. 3, reference numeral 20 denotes a fixed tank, and a burner basket 21 is attached to the upper part of the fixed tank 20. A cylindrical core guide 22 is erected from the inner lower part of the fixed tank 20. A cylindrical lamp wick 23 is fitted onto the outer peripheral surface of the lamp wick 23 so as to be vertically movable, and a wick holder 24 having a rack 24a is attached to the outer peripheral side of the lamp wick 23.

The outer end of a cylindrical shaft support tube 25 is fixed to one side of the fixed tank 20, and the rotating shaft 2 is inserted into the shaft support tube 25 through a collar 26.
7 is inserted, and a gear 28 that meshes with the rack 24a of the lead holder 24 is provided at the inner end of the rotating shaft 27, and as the rotating shaft 27 rotates, the gear 28, the rack 24a, and the lead holder 24 The lamp wick 23 is designed to move up and down.

On the outer side of the collar 26, the rotation shaft 2
7, a packing 29, a washer 30, a coiled packing spring 31, and a shaft nut 25a for preventing slipping off are fitted in order, and this shaft nut 25a is screwed into the inside of the shaft support cylinder 25.

Further, as shown in FIG. 4, a ratchet plate 32 is rotatably fitted onto the rotating shaft 27 on the outer side of the shaft nut 25a, and a spring case 33 is fitted on the inner side of the ratchet plate 32.
are integrally formed, and a coiled core lowering spring 34 and a coiled positioning spring 35 are provided within this spring case 33.
Further, a guide pin 36 is provided on the outer side of the ratchet plate 32, and a substantially dogleg-shaped flexible metal fitting 37 is provided around the guide pin 36 so as to be able to rotate within a certain range. This flexible metal fitting 37 is connected to the rotating shaft 2.
It abuts against a return pin 38 which is screwed onto the pin 7 and stands upright.

A ratchet wheel 39 is attached to the rotating shaft 27 via a spring pin 40 on the outside of the ratchet plate 32.
is fixed to the ratchet wheel 39, and a claw portion 41 is provided on the outer periphery of the ratchet wheel 39.

The rotating shaft 2 is located outside the ratchet wheel 39.
A claw metal fitting 42 is rotatably fitted into the eyelet 7, and a claw metal fitting 44 is rotatably supported on one side of the inner side of the claw metal fitting 42 via an eyelet 43. It rotates around 43 under its own weight and engages detachably with the claw portion 41 of the ratchet wheel 39. Further, a coil-shaped drive spring 45 is press-fitted onto the outer periphery of the boss portion on the outside of the claw metal fitting base 42 . That is, the drive spring 45 is press-fitted with its inner diameter smaller than the outer diameter of the boss portion of the pawl metal base 42, so that the drive spring 45 is wound so as to generate frictional resistance at the contact portion with the pawl metal base 42. A hoop portion 46 is provided in a part of this drive spring 45.

A driven gear 47 is rotatably inserted into the rotating shaft 27 at an outer side of the claw metal base 42, and a hoop portion 46 of the drive spring 45 is engaged with one side of the inner side of the driven gear 47. A matching protrusion 48 is provided, and a switch operating portion 49 is provided on one side of the outer side of the driven gear 47. The driven gear 47 is gear-coupled with a gear (not shown) connected to a drive motor 50 in FIG.

A switch mount 52 is located on the outside of the driven gear 47 and is attached to the rotating shaft 27 via a pin 51, and a micro switch 5 having an operating section 53 is mounted on one side of the inside of the switch mount 52.
4 is attached, and contact brushes 55 and 56 made of a conductive material are protruded from the outside of the switch mount 52 and connected to the micro switch 54 at an appropriate distance. Further, a contact receiver 57 is positioned on the outside of the switch mounting base 52 and fitted onto the rotating shaft 27, and this contact receiver 57 is prevented from coming off by a snap washer 58, and its lower end is attached to a mount. It is fixed to a contact receiving base 60 spot welded to 59,
Ring-shaped contacts 61 and 62 are fixed to the inner side of the contact receiver 57 to contact the contact brushes 55 and 56, respectively.

Furthermore, the attachment friction force of the drive spring 45 to the claw metal base 42 is determined by the center lowering spring 3
4, and the drive motor 50
It is set smaller than the rotational force of.

In addition, FIG. 5 shows a circuit, where 63 is a power supply, 64 is a normally closed contact 64a and a normally open contact 64b.
main switch, 65 is a fuse, 66
is a relay.

Next, the operation will be explained with reference to FIG. 6 as well as FIGS. 3 to 5.

Since the pawl fitting 44 rotates under its own weight, when the pawl fitting 44 is positioned above the pawl portion 41 of the ratchet wheel 39, the pawl fitting 44 engages with the pawl portion 41. When the kerosene heater is not in use, the claw metal fitting 44 is in the lower position, and the claw wheel 3 is in the lower position.
It does not engage with the claw portion 41 of No.9.

When using the kerosene stove, when the main switch 64 is operated to switch to the normally open contact 64b side and the drive motor 50 is energized, the drive motor 50 starts rotating and the rotational force is transferred to the driven gear 47.
The protrusion 48 of the driven gear 47 acts on the hoop 46 of the drive spring 45. This drive spring 45 is connected to the claw metal base 4
2, and frictional resistance is applied, so that the claw metal base 42 can be rotated clockwise in the same direction as the driven gear 47 without slipping between the claw metal base 42 and the driven gear 47.

As a result, the claw metal fixture base 42 is rotated by a predetermined angle,
The claw metal fitting 44 is located above the claw metal fitting base 42 as shown in FIGS. 3 and 4, and the claw metal fitting 44
rotates downward around the eyelet 43 due to its own weight, and the claw metal fitting 44 engages the claw portion 4 of the ratchet wheel 39.
1.

As a result, the ratchet wheel 39 begins to rotate clockwise, and the rotating shaft 27 connected thereto begins to rotate clockwise, causing the switch 54 to rotate clockwise together with the switch mount 52 fixed to the rotating shaft 27. , furthermore, the return pin 38 is attached to the flexible metal fitting 37.
By starting to press the latch plate 32 and rotating the ratchet plate 32 clockwise via the flexible metal fitting 37, the core lowering spring 34 starts to accumulate force. At this time, while rotating clockwise, the ratchet plate 32 engages the serrated portion on its outer periphery with a clutch lever from an unillustrated seismic sensor, acting to wind up the core lowering spring 34 while being prevented from reversing. .

As the rotating shaft 27 rotates clockwise in this manner, the wick 23 rises together with the wick holder 24 via the gear 28 and the rack 24a.

Then, due to the rotation of the drive motor 50, the lamp wick 2
For example, rotate the rotating shaft 27 until the rotation axis 3 reaches a predetermined height.
Rotate 1.5 turns. During this time, as described above, the claw metal fitting 44 of the claw metal fitting base 42 engages with the claw part 41 of the ratchet wheel 39 at the upper position, and then passes through the lower position due to rotation, but it has already engaged with the claw part 41. Since the pressing force due to rotation is continuously applied, even in the downward position, the engagement state is maintained without rotating downward due to its own weight and being disengaged.

Then, the rotating shaft 27 rotates 1.5 times to rotate the lamp wick 23.
When reaches a predetermined height position, the gear 2 of the rotating shaft 27
8 is located at the end of the rack 24a, and the rotating shaft 27 is stopped. At the same time, the switch mount 52 having the ratchet wheel 39 fixed to the rotating shaft 27 and the switch 54 stops, and furthermore, the pawl bracket 42 that engages the pawl fitting 44 also stops.

In this case, since the drive motor 50 continues to rotate, its rotational force remains transmitted to the driven gear 47, but since the pawl bracket 42 has stopped together with the rotating shaft 27 as described above, its rotation When the force overcomes the frictional force generated between the drive spring 45 and the pawl bracket 42, the drive spring 45 slips and rotates with respect to the pawl bracket 42, and the driven gear 47 rotates with respect to the rotating shaft 27. Rotate.

As the driven gear 47 rotates, the switch operating section 49 also rotates, and the switch 5 gradually stops.
4 approaches the operating section 53, and the switch operating section 49 further moves and presses the operating section 53, thereby turning off the switch 54, turning off the contact 66a of the relay 66, and cutting off the energization circuit to the drive motor 50. , the drive motor 50 is brought to a halt.

As a result, the power to the drive motor 50 is cut off, but the driven gear 47 continues to rotate due to the inertia of the rotor, so the switch actuating section 49 activates the switch 54.
This causes the switch 54 to return to the on state, but since the self-holding relay 66 is off, the drive motor 50
The energized circuit remains disconnected.

As the inertia disappears, the driven gear 47
As a result, the pawl metal fitting 44, which has lost the pressing force due to the rotational force, rotates under its own weight in the lower position and separates from the pawl portion 41 of the ratchet wheel 39.

In addition, when extinguishing a fire, by electrically or manually disengaging the latch plate 32 from a clutch lever (not shown), the rotary shaft 27 is rotated together with the latch plate 32 by the reversing force of the core lowering spring 34. While rotating clockwise, the lamp wick 2 is rotated through the gear 28 and the rack 24a.
Even if 3 falls, the fire will be extinguished.

[Effect of the invention] According to the invention, as the rotating shaft rotates, the wick rises, and when the rotating shaft stops when the wick reaches a predetermined height, the wick also stops rising, and the wick stops rising. Since the height at which the end of the rise is always constant, a stable combustion state can be obtained, and even if the drive motor continues to rotate when the wick has risen to the specified height, its rotational force is still the drive motor. It is set to overcome the frictional force between the spring and the claw metal base, so there is no need to worry about damage as unreasonable force is applied to the drive motor.Furthermore, an opening for installing the device can be drilled into the burner basket, etc. Since there is no need to install any other equipment, there is no risk of kerosene leaking through the opening, causing ignition, backfire, etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional device, Fig. 2 is a circuit diagram thereof, Fig. 3 is a sectional view showing an embodiment of the device of the present invention, Fig. 4 is a plan view of a part thereof, and Fig. 5 is a sectional view showing a conventional device. The figure is a circuit diagram, and FIG. 6 is a timing chart. 23... lamp wick, 24... wick holder, 24a...
Rack, 27... Rotating shaft, 28... Gear, 39...
...Rawl wheel, 41...Claw portion, 42...Claw metal fixture base, 44
...Claw metal fitting, 45 ...Drive spring, 46
... Hoop portion, 47 ... Driven gear, 48 ... Projection, 50 ... Drive motor.

Claims (1)

[Scope of Claim for Utility Model Registration] A wick lifter for a kerosene stove in which a gear on a rotating shaft rotated by a drive motor is engaged with a rack provided in a wick holder that holds the wick, and the wick is raised by the drive motor. The device includes a ratchet wheel fixed to the rotating shaft and having a claw portion on the outer periphery, and a claw metal fitting rotatably provided on the rotating shaft and detachable from the claw portion of the ratchet wheel, and the ratchet wheel is rotated by rotation. a claw metal fitting base that engages the claw metal fitting with the claw portion;
a drive spring that is wound around the outer periphery of the claw metal fitting base and has a hoop portion in a part thereof; A wick lifting device for a kerosene stove, comprising: a driven gear that rotates by receiving rotational force from a motor;